Just tested my 8500 on a 300 mile ride. No false alarms, and the reception on K and Ka was excellent on the 3-4 highway patrol I saw. My E66 windshield never allowed the same reception of signal. When I got in stop and go traffic or up to my garage door , it would pick up the K band given off by the active cruise, but was a non-issue in moving traffic.

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2009 750Li-Sport Pkg, Active cruise, HUD, Lux seat, Rear Enter, Conven, Prem Sound
2005 645ci
2003 745Li (sold)